I mean, everything they showed in the trailer is in NMS right now, and it's pretty clearly in the same engine.
With No Man's Sky, it was a [relatively] unknown studio making some pretty massive claims and then showing what turned out to be pretty exaggerated footage to sell it. There's no getting around the fact that they over promised and under delivered, to say the least.
But this is different. They have done everything they're saying and showing is in this new game now, it's in NMS right now, you can go play it and do all the same things but with a scifi flavour instead of fantasy. I'm not sure where people's doubts are coming from.
Whether or not it will be good is subjective, there are still people who don't like NMS' gameplay loop and that's fine it's not for everyone. But the features are there.